bemade of 和be made up of j以及be made from的区别

the car is made of steel.
the car is made from steel .
the car is made out of steel.
they all have the same meaning . it has nothing to do with whether the material is easy to be seen or detected .trying to 画蛇添足, only confuses you more.

同意楼上的，不过我举例说明
桌子是用木头做的，The desk is made of wood.因为我们一眼就能看出来桌子是木制的所以用be made of
纸是用树叶和木头做的，The paper is made from leaves and wood. 我们虽然知道纸是用树叶和木头做的，但那是老师告诉的，我们用肉眼很难一眼就看出它的原材料是树叶和木头，故用be made from。

1.be made of 是指"由.(材料)做的"其中这个材料是看得出的,即你一眼就可以知道是什么东西做的,比如The desk is made of stone.2.be made up of 是指"由.构成,组成的" 比如The group is made of five students.The co...

be made of 由某种材料制作而成，原材料显而易见
be made from 由某种材料制作而成，原材料很难一眼看出来
be made up of 由某些部分组成。